©2002 Fairchild Semiconductor Corporation RURD4120, RURD4120S Rev. B
RURD4120, RURD4120S
4A, 1200V Ultrafast Diodes
The RURD4120 and RURD4120S are ultrafast diodes with
soft recovery characteristics (t
rr
< 70ns). They have low
forward voltage drop and are silicon nitride passivated
ion-implanted epitaxial planar construction.
These devices are intended for use as freewheeling/
clamping diodes and rectifiers in a variety of switching power
supplies and other power switching applications. Their low
stored charge and ultrafast soft recovery minimize ringing
and electrical noise in many power switching circuits
reducing power loss in the switching transistors.
Formerly developmental type TA49036.
Symbol
Features
• Ultrafast with Soft Recovery. . . . . . . . . . . . . . . . . . . <70ns
• Operating Temperature . . . . . . . . . . . . . . . . . . . . . . 175
o
C
• Reverse Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200V
• Avalanche Energy Rated
• Planar Construction
Applications
• Switching Power Supplies
• Power Switching Circuits
• General Purpose
Packaging
JEDEC STYLE TO-251
JEDEC STYLE TO-252
Ordering Information
PART NUMBER PACKAGE BRAND
RURD4120 TO-251 UR4120
RURD4120S TO-252 UR4120
NOTE: When ordering, use the entire part number. Add the suffix 9A
to obtain the TO-252 variant in the tape and reel, i.e.,
RURD4120S9A.
K
A
ANODE
CATHODE
CATHODE
(FLANGE)
ANODE
CATHODE
CATHODE
(FLANGE)
Absolute Maximum Ratings
T
C
= 25
o
C, Unless Otherwise Specified
RURD4120, RURD4120S UNITS
Peak Repetitive Reverse Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
RRM
1200 V
Working Peak Reverse Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
RWM
1200 V
DC Blocking Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
R
1200 V
Average Rectified Forward Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
F(AV)
(T
C
= 152
o
C)
4A
Repetitive Peak Surge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
FRM
(Square Wave, 20kHz)
8A
Nonrepetitive Peak Surge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
FSM
(Halfwave, 1 Phase, 60Hz)
40 A
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P
D
50 W
Avalanche Energy (See Figures 10 and 11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E
AVL
10 mJ
Operating and Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T
STG
, T
J
-65 to 175
o
C
Data Sheet January 2002